Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Vacuum Pump: Testing and Inspection

Fig. 1 Control Unit Harness Connector Terminal Identification:





1. Turn ignition switch to the On position.
2. Connect a jumper wire between control unit harness connector terminal 4 and ground, refer to Fig. 1.
3. If the pump does not run, replace defective vacuum pump.
4. If the pump runs, refer to VACUUM PUMP VENT VALVE CHECK.